Improvement in casings for hot-air furnaces



D. B. MUCHMORE. Casing for Hot-Air Furnaces. 8vo.

No. 212,106. Patented Feb. 11,1879.

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NJTERS. PHOTD-UTHOGRAFHER, WASHINGTON. D. CV

UNTTED STATES PATENT OEEIGE.

DAVID B. MUCHMORE, OF MADISON, NEW JERSEY.

IMPROVEMENT IN CASINGS FOR HOT-AIR FURNACES, 80C.

Specification forming part of Letters Patent N0. 212, |06, datedFebruary 1l, 1879 5 application filed December 31, 1877.

To all whom it' may concern.

Be it known that I, DAVID B. MUCHMORE, of Madison, in the county ofMorris,in the State of N ew Jersey, have invented certain new and usefulImprovements in Heat-Tight Gases or Shells for Furnaces, Hot-Air Flues,and other like purposes, and I do hereby declare that the following is afull and exact description thereof, reference being had to theaccompanying drawings, forming a part of this speciiication.

This invention has for its object to furnish a cheap, compact anddurable non-conductin g shell or case for furnaces, hot-air nues, andother like purpose where it is desirable to prevent loss of heat byradiation 5 and the invention consists in constructing such shells orcases in sections of proper length by cementing together two concentricshells of sheet metal by means of plaster-of-paris or othernon-conducting cement, the sections being jointed together by means of aflange or projecting portion on the outer shell of one seetion cominginto close contact with the outer shell of the adjacent section.

In the drawings, Figure l is a vertical section of a furnace providedwith my invention, and Figs. 2 and 3 are longitudinal sections ofpipe-casings embodying my invention.

The letter a. represents two concentric shells, of sheet metal, locatedone within the other, so as to leave a space between the two, the sizeof which space will be in accordance with the use the article is to beapplied to. The

space is filled with plastic plaster-of-paris, hydraulicorothernon-conductingcement,b,whieh soon hardens, and not only serves asa nonconductor of heat, but also serves as a means for uuitin g, withoutthe aid of other fa-stenin gs,

the two shells composing a section.

In order that the sections may be readily l united, I provide a flange,c, near or at the outer edge of one or both ends, which flange, when twoor more sections are brought together, comes into close contact with theouter shell of the adjacent section, forming a close, tight lap-jointbetween the two; or the outer shell of a section may be made longer atone end, as at c', Figs. 2 and 3, than the inner shell, so as to receivewithin it the end of the adjacent section, in order to form a joint.

What I claim is- A casing for heatin g apparatus, composed of twoconcentric shells of sheet metal, cemented together-with non-conductingmaterial, and formed into sections, which are united by lapjointsconstructed of a tlange or projection upon the outer edge of one sectionarranged to closely engage the outer shell of the adjacent section,substantially as described and shown.

In testimony whereof I have hereunto set my hand this 9th day of April,A. D. 187 7.

DAVID MUCHMORE.

Vitnesses A. J. DE LACY, J. C. CLAYTON.

